In order to splice 2 #16 awg to 2 #14 awg, you'd need at least a 3/4" LB,LR,T, or C.
http://www.appletonelec.com/PDF/AEC%20FM9.pdf
I see it all the time, too.... Half inch LB, or maybe a T with several #14 wires continuing on through with two of them spliced to a solenoid coil.
Actually in many cases , there does seem to be plenty of room, though.
A 1/2" C or LB with 2 - 14's spliced to 2 - #16's is gonna look half empty...
or is it half full?...
I'd like to be an optimist, but I just don't think it'd work out.:wink: